Layout doesn't resize when settings are toggled #3027

Bug Report

Steps to Reproduce:

This is reproducible on the Perspective website.

1. Go to the file example: https://perspective.finos.org/block/?example=file
2. Upload this example csv (or any csv but it helps to see it on one with only a few columns)
3. Toggle the settings on and off

Expected Result:

I expect the gray bottom border separating the table headers from the cells to extend all the way to the right of the viewer as it did before toggling the settings

Actual Result:

A vertical line persists after the last column header and the bottom border stops at the end of the last column column header instead of going all the way to the right

Environment:

Tested on 3.7.0 on the Perspective website
Version 138.0.7204.93 (Official Build) (arm64)
MacOS 15.5

Additional Context:

It is fixed by resizing after settings are toggled

viewer.addEventListener('perspective-toggle-settings', () => {
  viewer.resize();
});

Video: https://github.com/user-attachments/assets/18769b3d-9047-49ab-8a53-d0b306bd5738